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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f84fa45ad9073559b70e0c5e880607a183d72cf5a6f933c6c1959565928917e' 
  AND token = 'E0QatBtB9f+ZxmBb1jhAa/yjcODXKk6g6sL1DrcuAbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}